Method of making u-shaped pipe-bends.



P.- BSCH.

METHOD or MAKING U-SHAPBD PIPE BBNDs.

APLIOA-TION FILED SEPT.22, 1910. Y A

' Patented Oct. 7, 1913.

ATTORNEYS .llglNlillFD STATFbt PATENT PETER ESCI-, OFDUSSELDORF,GERMANY, ASSGNR TO SCHMIDTSCHEHEISSDAMPF- GESELLSCHAFT MITBESCHRNKTER'HAFTU-NG, 0F CASSEL- GERMANY, A COR- roRATIoi'v or' GERMANY.

METHOD OF MAKING T T-SHAPED PIPE-BENDS.

To all whom it may concern 4 Be it known that l, PETER ESCH, a subjectof the German Emperor', residing at Dusseldorf, Germany, have invented anew and useful Improvement in a Method of Making U-Shaped Pipe-Bends, ofw-hich the following is a specification. Y

.My inventionconcerns the making o-f U- shaped pipe bends andparticularly lsuch bends when used in connection with boilers,superheaters aiidgenerally when exposed to high temperatures or whenused to carry steam or fluids under pressure.

lrly invention relates particularly to such bends as aforesaid when thetwo legs of the bend are required te be very close together.

.fi primary object of` my inventionl is to provide a methodl of makingpipe bends which yshall involve very simple tools and accessories and aninexpensive labor factor and yet result in the production'o-f bends ofgreat strength and uniform character.'

Other objects of my invention will appear as the specification proceeds.

My improved method of making U-shaped pipe bends consists essentially infirst preparing by any suitable method an element comprising two lengthsof tube connected by a bridge piece and then welding to suoli bridgepieceand the adjacent tube ends the edge or rim of an apprcpriate bellor domeshaped'cap.

Referring to the drawings, l Figure 1 represents .a central sectionthrough the two legs of a preferred form of U bend made according to myinvention; Fig. 2 is a section taken on the' line 2 2 of Fig. 1; Figs.lBand 4 show thelfirst and second steps in the pro-duction of theelementto which the cap is to be welded; Fig. Y5 is a plan view of Fig.4; Fig. 6 represents a longitudinal section through a preferred form ofcap; Fig. 7 is a section taken along the line 7-7 of Fig. 6; Fig. 8 is asectional plan view taken from below of Fig. 6;,Fig. 91s a longitudinalsection taken on the longer avis of the flattened tube" from which 'the'cap of Fig. 6 is made; Fig. 10 is a cross sec: tion of the same tube;Fig. 11 illustrates the way in which the cap of Fig. 6 is made, thedotted construction showing the two steps of the method; Fig. 12 showsay modified form of cap together with a mandrel used in thisconstruction; and Figsi 13' and 14 Specification of Letters Patent.

Patented-@ct .-7, 1913.

Application filed September 22, 1910. Serial No. 583,171.

show respectively a horizontal section (line 13-13 Fig. 14), and acentral longitudinal section (line 14-14 Fig. 13') of amodified form ofU-bend made according to myinvention, the hollow cap being omitted.

The form of bend shown in the figures is preferably made as follows: Atube of suitable bore and wall thickness is selected and a .pair oftransverse cuts made nearly through, the incomplete ring lying betweenthese cuts then being removed; this results in a pair of ends, a, bconnected by a narrow bridge piece c. rllhese two legs a.; b are thenbent downwardly about a transverse axis through the bridge piece c (Fig.4)

vand constitute the legs of the bend which is to be formed; the lengthof the bridge piece c, itself fixed bv the distance between the originalcuts, determines the distance between the legs. To complete the U bend aflattened piece of tube e, (Figs. y9 and 10), the cross-section ofwhichis such that its curves will coincide with the curves of the two lengthsa, b, is employed. vThis tube is mounted upon a mandrel d, (Fig. 11) andits free end or edge suitably folded or formed .upon'the mandrel untilit assumes the shape shown dotted in Fig. 11, the butt-joint be ingfinally closed by welding. The cap f thus produced has itsV sides bentinwardly (Figs. 7 and 8) so as to conform with the two lbends a, b, andtheir' connecting bridge piece, and is then welded in position, thusproducing a'coinpleted bend as shown in Figs. 1 and 2.

instead of producing the leg elementof Fig. 4 -from a single tube bycutting as has Ebeen described, various other procedures may be usedWithout departing from the spirit of my inventio-n. For example, (Figs.13 and 14) two separate tube lengths may be squared ofi", placed side byside at the required distance apart, and then have a separate bridgepiece c of suitable length welded to them. The mandrel d may also bevaried in shape according as taste or special requirements may dictate.Furthermore, in-

.stead of forming the cap f from a piece of flattened tube mounted upona mandrel, I

'may, if il desire, make this cap by pressing from a single piece ofmetal. Other ways of making this cap may conceivably be emy ployed.

An advantage of making tube bends in the manner described is that it isunnecessary to do any welding in the often very narrow and unaccessibleportion lying between the two legs a, I), (Fig. 4). Further more, informing the bend, it is only neces sary to handle two elements, namely,the two tube lengths connected by the bridge piece and the cap.

ll'hen the caps are made as has just been described for Figs. l) to 12,the thickening kor reinforcement of the tip or cap is obtained entirelyfrom the` material of the cap itself and results naturally fro-n1- thefolding over of the tube edges. This thickening at this particular pointis very desirable, as it is at this point as a rulethat the bend isexposed to the hottest furnace gases. The known method of adding eXtramaterial by welding is obviously more expensive as well as less durableand strong. I The process and product as above described substantiallyutilizes all the raw ma terial, while possessing the additionaladvantage that the legs of the bend may be placed as close together asmay-be desired.

Having described my invention, I claim l. The method of making U-shapedpipe bends whichconsists in uniting two legs by a bridge piece and thenuniting the open edges of a cup-shaped or hollow cap to the edges of thebridge piece and adjacent legs, substantially as and for the purposedescribed.

2. The method of making U-shaped pipev bends which consists in unitingtwo legs by a bridge piece. then forming a hollow cap by taking a shortlength of attened tube and closing one end thereof, and finally unitingthe-open edges of saidl cap to the edges of the bridge piece andadjacent legs, substantially as and for the purpose described.

3. The method of making U-shaped pipe bends which consists in unitingtwo legs by a bridge piece, then forming a. hollow cap by taking a shortlength of flattened tube and closing one end thereof by pressing upon amandrel, and welding.,- and finally uniting the edges of the bridgepiece. and adjacent legs, substantially as and for the purposedescribed. 4. The method of making U-shaped pipe @bends which comprisesuniting two pipe ends and in then uniting a cup shaped or hollow cap tothe free edges of said ends.

filler piece between said pipes at the 'end and welding it in position,and placing a cap over said ends and"filler and welding said cap n1place.

t. Tie herein descr1bed process of connecting the ends of substantiallyparallel metal pipes which consists in placing a filler piece betweensaid pipes at the end and welding it in position, and placing a cap oversaid ends and filler and welding said cap to said pipes and to said lleralong its edge.

8. The herein described process .of connecting the ends of substantiallyparallel metal pipes which consists in placing a closely fitting fillerpiece between said pi s, flush with their ends and with their sildss,welding-said parts together, fitting an oblong cap over the ends ofsaid` pipes and over said lillern piece, the margin of said cap beingtlush witlrthe sides of said lpipes and filler, and welding said cap inplace.

9. The method of making pipe bends which consists in providing twolegsunited by a bridge piece and then uniting the open edges of a cup shapedor hollow cap to the edges of the bridge piece and adjacent legs,substantially as and for the purpose described.

10. The Vmethod of making pipe bends which consists in providing twolegs united by a bridge piece, then forming a hollow cap b-y taking ashort length of flattened tube and closing one end thereof, andnallyuniting the open edges of said cap to the substantially as and for thescribed.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.v

PETER ESCI-l. [1.. s]

